In May 2024, Earth experienced a powerful geomagnetic storm, the most intense since a series of storms known as the Halloween storms in 2003. This event, dubbed a "superstorm," produced stunning auroras visible far beyond the usual polar regions and caused disruptions to GPS signals used by agricultural machinery and other technologies. The storm also had a dramatic effect on the Van Allen radiation belts—two donut-shaped regions around Earth that trap high-energy particles from the solar wind. These belts are crucial for understanding space weather and its impact on satellites and communication systems. During the superstorm, satellite observations recorded a sudden and significant loss of highly energetic electrons in the outer Van Allen belt. This unusual depletion was studied in detail by Xingzhi Lyu and colleagues, who published the first comprehensive analysis of how such rapid electron transport occurs in the journal AGU Advances. The Van Allen belts are shaped by Earth’s magnetic field and can be affected by geomagnetic storms, which can cause sudden changes in the movement of charged particles. These changes can threaten satellites and other space-based technology, though the exact mechanisms behind rapid electron loss during extreme storms had remained unclear until now. To investigate the event, researchers analyzed data from Japan’s Arase satellite, which measured the dramatic drop in electrons in the outer radiation belt during the superstorm. Using the Versatile Electron Radiation Belt (VERB) model—a tool designed to simulate radiation belt behavior—they identified two key processes responsible for the electron loss: magnetopause shadowing, which transports electrons outward and releases them into space, and local wave scattering, which moves electrons inward toward Earth’s upper atmosphere. The relative influence of these processes varied depending on the region of Earth’s magnetic field. The study found that for the simulations to match the real-world electron loss observed during the superstorm, the outward transport of electrons caused by magnetopause shadowing had to occur almost simultaneously with a sudden compression of Earth’s magnetosphere. This compression was followed by the local wave scattering process. Current models used in space weather forecasting do not account for this tightly timed interaction between magnetospheric compression and electron transport. These new findings could lead to more accurate models, improving the ability to predict and assess risks from extreme space weather events like the May 2024 superstorm.